Humic acid is a kind of biological activity agent which could improve soil active potassium content and reduce potassium loss and fixation. It has the function of improving the NPK efficiency, improving soil structure, Promoting crop growth, enhancing crop’s resistant ability to adverse environment conditions, improving crop quality and protecting agro-ecological environment etc. After mixed with urea, phosphatic fertilizer and potassic fertilizer, efficient multi-functional compound fertilizer could be prepared. It also has a significant drought resisting effect. The C.E.C of Sunmatte humic acid is 400-500meq/100g which is recognized to be very high. It could improve more than 30% of the fertilizer efficiently.